Android Question Need a plain-Jane bluetooth serial program >

[Ash Powers]

In short, I need my android program to operate as a terminal would.

I have had NO success trying to get the old serial example or the new bluetooth example to do anything other than crash the BTserial port on my RPi3. (whatever the Android app IS sending, it is hanging up the rfcomm on the RPi3, requiring a reboot to correct it.)

Yes, I am connected; using the connection utility within these programs (Serial Example and Bluetooth)

When I run BlueTerm on my Android, I can send commands to my RPi (running a custom application) and it works beautifully. These commands are just simple strings of data. I've come across posts talking about astreams and prefix and blah blah blah - I'm old school and would prefer to communicate through a plain-Jane serial port using my own error checking, etc etc.

SerialExample appears to be pretty much just that, but as stated, I can neither send nor receive ANY data. With blueterm, I can do both, from either device, and both at the same time. So it isn't an issue with the hardware or connection.

The RPi is using UTF-8.

Is the textwriter sending anything other than the string data? No header, no EOL char?
Is the textreader doing anything to the string data coming in?

Thanks and I hope to hear back soon!

 

[Ash Powers]

This ended up being quite helpful..
https://www.b4x.com/android/help/files.html#textwriter_write

The original example program was using a writeline and readline parameter. Simple "read" and "write" behave as I am accustomed to.

 

[Erel]

You should never use TextWriter / TextReader with network connections. Your program will eventually hang.

You should use AsyncStreamsText if the data sent is text and is line based:
[class] AsyncStreamsText - Useful when working with streams of text

 

[Ash Powers]

Hi Erel!

I have come across countless numbers of your helpful posts here.

I've actually got it running solid with textwriter/textreader but I will look into the asyncstreamstext. All of the data I'm moving over that connection is purely numbers so that shouldn't be a problem. Perhaps I'm not having issues as I've written my own error handling into it all. Let me finish hammering out the rest of the program and I'll come back around to this when I start optimizing things..

Thanks!
-Ash

 

[tigrot]

Download a Bluetooth Terminal(free from Google Play) test the connection and then develop you APP. I developed my APP to manage Numeric Control BT/RS232 converter in such a way.